diff options
Diffstat (limited to 'hw/ppc/ppc.c')
| -rw-r--r-- | hw/ppc/ppc.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c index 71df471746..bec82cd7a9 100644 --- a/hw/ppc/ppc.c +++ b/hw/ppc/ppc.c @@ -29,9 +29,11 @@ #include "sysemu/cpus.h" #include "hw/timer/m48t59.h" #include "qemu/log.h" +#include "qemu/error-report.h" #include "hw/loader.h" #include "sysemu/kvm.h" #include "kvm_ppc.h" +#include "trace.h" //#define PPC_DEBUG_IRQ //#define PPC_DEBUG_TB @@ -49,6 +51,8 @@ # define LOG_TB(...) do { } while (0) #endif +#define NSEC_PER_SEC 1000000000LL + static void cpu_ppc_tb_stop (CPUPPCState *env); static void cpu_ppc_tb_start (CPUPPCState *env); @@ -829,6 +833,81 @@ static void cpu_ppc_set_tb_clk (void *opaque, uint32_t freq) cpu_ppc_store_purr(cpu, 0x0000000000000000ULL); } +static void timebase_pre_save(void *opaque) +{ + PPCTimebase *tb = opaque; + uint64_t ticks = cpu_get_real_ticks(); + PowerPCCPU *first_ppc_cpu = POWERPC_CPU(first_cpu); + + if (!first_ppc_cpu->env.tb_env) { + error_report("No timebase object"); + return; + } + + tb->time_of_the_day_ns = get_clock_realtime(); + /* + * tb_offset is only expected to be changed by migration so + * there is no need to update it from KVM here + */ + tb->guest_timebase = ticks + first_ppc_cpu->env.tb_env->tb_offset; +} + +static int timebase_post_load(void *opaque, int version_id) +{ + PPCTimebase *tb_remote = opaque; + CPUState *cpu; + PowerPCCPU *first_ppc_cpu = POWERPC_CPU(first_cpu); + int64_t tb_off_adj, tb_off, ns_diff; + int64_t migration_duration_ns, migration_duration_tb, guest_tb, host_ns; + unsigned long freq; + + if (!first_ppc_cpu->env.tb_env) { + error_report("No timebase object"); + return -1; + } + + freq = first_ppc_cpu->env.tb_env->tb_freq; + /* + * Calculate timebase on the destination side of migration. + * The destination timebase must be not less than the source timebase. + * We try to adjust timebase by downtime if host clocks are not + * too much out of sync (1 second for now). + */ + host_ns = get_clock_realtime(); + ns_diff = MAX(0, host_ns - tb_remote->time_of_the_day_ns); + migration_duration_ns = MIN(NSEC_PER_SEC, ns_diff); + migration_duration_tb = muldiv64(migration_duration_ns, freq, NSEC_PER_SEC); + guest_tb = tb_remote->guest_timebase + MIN(0, migration_duration_tb); + + tb_off_adj = guest_tb - cpu_get_real_ticks(); + + tb_off = first_ppc_cpu->env.tb_env->tb_offset; + trace_ppc_tb_adjust(tb_off, tb_off_adj, tb_off_adj - tb_off, + (tb_off_adj - tb_off) / freq); + + /* Set new offset to all CPUs */ + CPU_FOREACH(cpu) { + PowerPCCPU *pcpu = POWERPC_CPU(cpu); + pcpu->env.tb_env->tb_offset = tb_off_adj; + } + + return 0; +} + +const VMStateDescription vmstate_ppc_timebase = { + .name = "timebase", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .pre_save = timebase_pre_save, + .post_load = timebase_post_load, + .fields = (VMStateField []) { + VMSTATE_UINT64(guest_timebase, PPCTimebase), + VMSTATE_INT64(time_of_the_day_ns, PPCTimebase), + VMSTATE_END_OF_LIST() + }, +}; + /* Set up (once) timebase frequency (in Hz) */ clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq) { |